Lumbar medial branch blocks are a common treatment approach that is used to treat and diagnose back pain as well as discomfort in the buttocks, hips, and groin. Several studies have reported that the degeneration and inflammation of facet joints causes between 10% and 15% of chronic back pain cases. It has also been reported, however, that a medial branch block effectively reduces inflammation in facet joints that is the result of irritated nerves.